CN112696215B - Deep high-temperature rock stratum roadway heat-insulation support system and construction method thereof - Google Patents
Deep high-temperature rock stratum roadway heat-insulation support system and construction method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a deep high-temperature rock layer roadway heat insulation support system and a construction method thereof, wherein the deep high-temperature rock layer roadway heat insulation support system comprises a grouting heat insulation system, a high-strength support system and a temperature detection system, and the three systems are connected through an integral connecting device; the grouting heat insulation system injects heat insulation grouting materials into a hollow grouting anchor rod which is driven into an anchor rod hole, and then overflows and diffuses to surrounding crushed rock mass to form an outer layer heat insulation support and protection ring; the high-strength supporting system is characterized in that a heat-resistant metal net, a high-strength support and a heat-insulating guniting layer are sequentially paved on the surface of the surrounding rock of the roadway to form an inner-layer heat-insulating supporting and protecting ring; the temperature detection system measures the temperature by penetrating the temperature sensor through the rigid protective sleeve inserted into the temperature measurement hole to reach the designated position, and displays the reading on the control host. The invention can meet the long-term heat insulation requirement of the roadway, can also meet the high-strength supporting requirement of the roadway, reduces the construction risk, saves the construction cost and provides guarantee for the safe and smooth operation of the full life cycle of the deep roadway.
Description
Technical Field
The invention belongs to the technical field of underground engineering disaster prevention and reduction, and particularly relates to a heat-insulation support system suitable for a deep high-temperature rock layer roadway and a construction method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Mine resources such as coal, iron ore, gold ore and the like are taken as main energy sources in China, and great contribution is made to the long-term development of industry. In recent years, shallow resources in China are increasingly exhausted, and the energy demand is gradually increased, so that deep mining of mines is in a normalized trend. However, deep mining also reveals some relatively difficult technical problems, and the sievert and the courtyard have pointed out that "high ground stress, high ground temperature and high osmotic pressure" are the main bottlenecks affecting deep mining in the future. Among them, the construction of high-ground-temperature and high-ground-pressure mines becomes one of the important subjects of cross-research in the subject fields of mining engineering, geotechnical engineering and the like.
On the one hand, deep mining of mines is in a high temperature environment as the mining depth of the mines increases. According to statistics, when the depth of the stratum below a constant temperature zone is increased by 100m, the corresponding ground temperature can be increased by 2-3 ℃, when the mining depth reaches about 700m, the ground temperature can reach more than 40 ℃, and for a mining area with the mining depth exceeding kilometers, the initial temperature in the hole is far higher than the body surface temperature of a person. The heat damage caused by high ground temperature changes the climate conditions of the mine, reduces the labor production efficiency, increases the injury probability of workers, seriously threatens the safety production of the mine, and becomes the sixth mine disaster following roof, gas, fire, dust and water damage. Therefore, the heat damage treatment of the mine is already to a very urgent degree. For the control of the thermal damage of the high-temperature mine, the main approaches comprise an active cooling measure of non-mechanical refrigeration and a passive cooling measure of mechanical refrigeration, wherein the mechanical refrigeration is the development trend of the deep well thermal damage prevention and control technology. However, the mechanical refrigeration equipment is limited to a plurality of factors such as economic level, production management, mining condition and the like in China, and the popularization rate and the effect of the mechanical refrigeration equipment are not ideal. Therefore, it is necessary to search for a series of non-mechanical refrigeration methods such as increasing air volume and isolating heat source, mainly for "prevention".
On the other hand, with the increase of the mining depth of the mine, the pressure of the roadway top plate is increased, the roadway surrounding rock presents obvious soft rock deformation characteristics, and even the rheological process of the roadway surrounding rock develops into rock burst. The deep mining causes the redistribution of the original rock stress field, so that the development and evolution of the energy field and the stress field become conditions for mine disaster inoculation. In order to ensure the smooth progress of mine construction, certain support measures must be taken. In consideration of the characteristics of large deformation, high ground pressure, strong rheology and the like of deep roadway surrounding rock, the actual requirement on support strength is difficult to meet by adopting the traditional passive support methods such as brickwork, metal supports and the like. Different from the prior art, the anchor bolt support is taken as an active support method and a derived combined support method such as anchor spraying support, anchor net spraying support, anchor grouting support and the like, and is rapidly popularized and popularized due to low support cost and obvious support effect. However, in a geological environment of high ground stress soft rock, a deep tunnel has the problems of single supporting function and unreasonable design, which causes a great deal of repair. In addition, the supporting modes can not effectively solve the problem of heat damage of deep roadways at the same time. Therefore, it is necessary to further study the deep roadway heat insulation support system, which can not only exert the heat insulation and cooling function, but also transmit the stress of the surrounding rock.
In order to reasonably and safely mine deep mineral resources, scholars have obtained measures for jointly treating mine thermal damage and ground pressure through a series of researches, such as: 1. deep mine high temperature heat evil is strutted with tunnel and is jointly administered device (application number is CN201420657020.1), and the device includes that the vacuum props up the backplate, and is fixed through two tray anchor rod devices between the adjacent vacuum props up the backplate, and the mainboard inboard of the backplate is scribbled the anti-heat radiation layer that props up in vacuum. However, the device is difficult to effectively isolate radiant heat energy generated by deep roadway surrounding rocks by only one layer of vacuum supporting and protecting plate, and a square box type cavity in the vacuum supporting and protecting plate needs to be evacuated and dehumidified by a vacuum pump, so that the process is time-consuming and labor-consuming; 2. a supporting and cooling system and method (application number is CN201710017712.8) for a thermal damage mine roadway, wherein a refrigerating device, a hollow cooling anchor rod, a main cooling supply pipeline, a main return pipeline, a branch cooling supply pipeline and a branch return pipeline are communicated to form a loop, a heat exchange medium can circulate in the loop, and the heat exchange medium continuously exchanges heat with roadway surrounding rocks to reduce the temperature of the surrounding rocks. However, the system adopts a mechanical circulation refrigeration method, the equipment operation and maintenance cost is too high, the manufacturing process of the hollow cooling anchor rod is complex, and a reserved space is needed for a cold supply pipeline and a return pipeline, so that the support strength of the hollow cooling anchor rod can be weakened; 3. a deep high-ground-temperature roadway heat-insulating lining structure and a construction method thereof (application number is CN201710408796.8) are disclosed, the structure is characterized in that a hollow grouting anchor rod is used for injecting heat-insulating slurry materials to form a grouting heat-insulating ring, a primary lining heat-insulating layer is arranged to form a primary support, and a secondary lining heat-insulating layer is constructed after a roadway is deformed stably. Although the structure forms a multi-layer heat insulation structure and simultaneously meets the requirements of roadway support, for certain roadways with longer service life, the support structure can be damaged or destroyed to a certain extent under the influence of mining, so that the structure cannot ensure the long-term heat insulation effect and stability of the roadway; 4. a heat insulation device for mine roadways and a construction method thereof (application number is CN201911161944.6) are provided, the device adopts a solid waste heat insulation template and is fixedly arranged on surrounding rocks through an anchor cable and an anchor rod, a concrete layer is sprayed on the outer wall of the solid waste heat insulation template, and a temperature sensor is arranged for calculating the thickness of the initial shape of the solid waste heat insulation template. The device adopts 50% anchor pretightning force in the work progress, when can solving the tunnel and warp, the support of high pretightning force became invalid, and thermal-insulated template and country rock separation problem, however, the thermal-insulated template can not deepen the tunnel country rock deep and come the crack of shutoff broken rock mass to deep strong stream becomes soft rock tunnel, supporting construction still can become invalid, and reprocesses the difficulty.
In conclusion, the existing deep roadway heat insulation support system has a certain effect, but still has certain defects, and the problem of high temperature heat damage of the deep roadway and the symbiosis of the support cannot be effectively solved for a long time. Therefore, it is necessary to provide a new technical scheme, which can meet the long-term heat insulation requirement of the roadway, can also meet the high-strength supporting requirement of the roadway, reduces the construction risk, saves the construction cost, and provides guarantee for the safe and smooth operation of the full life cycle of the deep roadway.
Disclosure of Invention
The invention aims to provide a deep high-temperature rock roadway heat-insulation support system and a construction method thereof aiming at the defects in the background technology, which can meet the long-term heat-insulation requirement of the roadway, can also meet the high-strength support requirement of the roadway, reduce the construction risk, save the construction cost and provide guarantee for the safe and smooth operation of the full life cycle of the deep roadway.
In order to achieve the purpose, the invention adopts the technical scheme that: a deep high-temperature rock stratum roadway heat insulation support system is characterized by comprising a grouting heat insulation system, a high-strength support system and a temperature detection system, wherein the three systems are connected through an integral connecting device; the grouting heat insulation system injects heat insulation grouting materials into a hollow grouting anchor rod which is driven into an anchor rod hole, and then overflows and diffuses to surrounding crushed rock mass to form an outer layer heat insulation support and protection ring; the high-strength support system is characterized in that a heat-resistant metal net, a high-strength support and a heat-insulating guniting layer are sequentially paved on the surface of surrounding rock of a roadway to form an inner-layer heat-insulating support and protection ring; the temperature detection system measures the temperature by penetrating the temperature sensor through the rigid protective sleeve inserted into the temperature measurement hole to reach the designated position, and displays the reading on the control host.
Preferably, the diameter of the anchor rod hole is 20-45mm, and the depth is 1500-3000 mm; the diameter and the depth of the temperature measuring holes are the same as those of the adjacent anchor rod holes, and the temperature measuring holes and the adjacent anchor rod holes are arranged in parallel along the trend of the roadway at a distance of 200-300 mm.
Preferably, the integral connecting device consists of a channel steel and two straight steel plates welded at the tail ends of the leg parts of the channel steel, and the appearance of the integral connecting device is in a symmetrical concave shape; the channel steel is in contact with the high-strength support, the length of the channel steel is 150-; the two straight steel plates are respectively contacted with the hollow grouting anchor rod and the rigid protective sleeve, the length and the thickness of each straight steel plate are the same as those of the channel steel, and the width of each straight steel plate is 100-150 mm; and a circular hole is drilled in the center of the straight steel plate, the diameter of the circular hole is 5-10mm smaller than that of the anchor rod hole, and the two circular holes are respectively coaxial with the anchor rod hole and the adjacent temperature measuring hole.
Preferably, the hollow grouting anchor rod consists of a hollow anchor rod body and a matched component, wherein the matched component comprises a steel expansion shell anchor head screwed in the top end of the hollow anchor rod body, and the hollow grouting anchor rod is used for anchoring by itself without falling off and ensuring the centering of the position of the hollow grouting anchor rod; the length of the hollow anchor rod body is 50-100mm greater than the depth of the anchor rod hole, the wall thickness is 5-7mm, the diameter is 1-2mm smaller than that of the circular hole, and the outer surface of the hollow anchor rod body is provided with continuous threads matched with the pre-tightening nut; the tray is a square protruding round hole anchor plate, the side length of the tray is not more than the width of a straight steel plate, the purpose is to enable the side wall of the section of the high-strength bracket to be attached to the inner side of the leg end of the channel steel without being blocked by the tray, and the sum of the thicknesses of the tray and the pre-tightening nut is equal to the difference between the height of the inner side of the waist end of the channel steel and the width of the inner side of the leg end; the bottom end of the hollow anchor rod body is coated with heat-resistant polyurethane resin and solidified to form a stable section, the coating length is half of the length of the hollow anchor rod body, and the purpose is that slurry in the hollow anchor rod body is not influenced by high temperature after being condensed and is always kept in a stable state; drilling slurry overflow holes on four sides of the top end of the hollow anchor rod body, wherein the drilling length is half of the length of the hollow anchor rod body, the diameter of each slurry overflow hole is 5-10mm, and the distance between the slurry overflow holes is 10-50mm, so that slurry overflows from the hollow anchor rod body and enters into a crack of a crushed rock body; the hollow anchor rod body is just inserted into the circular hole, the screw-in fixing nut is connected with the integral connecting device, the specification of the fixing nut is consistent with that of the pre-tightening nut, and the sealing plug is plugged in after grouting, so that the hollow grouting anchor rod does not leak the grout in the grout condensation process.
Preferably, the heat-insulating grouting material takes portland cement, river sand, fly ash and vitrified micro bubbles as main materials, is poured into a stirring barrel of the stirring and grouting all-in-one machine, is added with water, is mixed and stirred to form grouting slurry, and is injected into the hollow anchor rod body through a slurry outlet pipe of the stirring and grouting all-in-one machine; the heat-insulating grouting material is tested to be not more than 0.2W/(m.K) in heat conductivity coefficient and not less than 10MPa in cubic compressive strength; the inner diameter of the grout outlet pipe is 1-2mm larger than the diameter of the hollow anchor rod body; the tail end of a cleaning pipe of the stirring and grouting all-in-one machine is just sleeved on a water pipe water separator hung on a roadway wall part, and the purpose is to clean the stirring and grouting all-in-one machine in time so as to replace different grout.
Preferably, the heat-resistant metal net is a diamond net or a graticule subjected to heat-resistant polyurethane resin coating treatment, and is in close contact with the wall of the roadway by means of a tray, the mesh size of the heat-resistant metal net is 5-25mm larger than the diameter of the anchor rod hole, and the purpose is that the grout stop plug can be smoothly placed at the hole opening of the anchor rod hole.
Preferably, the high-strength support is a cast-in-place constraint concrete support of which the surface of a constraint shell is coated with heat-resistant polyurethane resin, and the constraint shell can be a flexible constraint shell comprising a fiber reinforced composite material or a rigid constraint shell comprising a steel pipe; the section of the restraint shell is square or round, the side length or the diameter of the section is equal to the height of the inner side of the waist end of the channel steel, and the purpose is to enable the high-strength bracket to be in close contact with the channel steel and the wall of the roadway; the cast-in-place confined concrete support is formed by pouring high-temperature-resistant concrete from a grouting opening at the top end of a confined shell and curing the high-temperature-resistant concrete, the diameter of the grouting opening is equal to that of the hollow anchor rod body, and the aim is that the tail end of a grout outlet pipe of the stirring and grouting integrated machine is just sleeved on the grouting opening; the high-temperature resistant concrete is ceramsite concrete doped with fly ash, and silicate cement, river sand, fly ash and shale ceramsite are used as main materials, poured into a stirring barrel of the stirring and grouting all-in-one machine, added with water, mixed and stirred to form filling slurry; the heat conductivity coefficient of the high-temperature resistant concrete is not more than 0.4W/(m.K) measured by tests, and the cubic compressive strength is not less than 30 MPa.
Preferably, the heat-insulating guniting layer is a heat-insulating protective layer which is formed by spraying guniting slurry on the wall of the roadway and can cover the heat-resistant metal mesh and the high-strength support, the thickness of the heat-insulating guniting layer is 150-200mm, and the purpose is to optimize the shape of the section of the deep roadway; the material and the mixing proportion of the guniting slurry are consistent with the filling slurry of the high-strength support, and the aim is to reduce the replacement times of the slurry in the stirring and grouting integrated machine so as to save the construction time.
Preferably, the rigid protective sleeve consists of a hollow threaded rod, a thin-wall steel pipe and a matched reducing joint; the inner diameter of the small diameter of the reducing joint is equal to the diameter of the circular hole, the small diameter is provided with continuous threads matched with the hollow anchor rod body, the inner diameter of the large diameter is equal to the diameter of the temperature measuring hole, and the thickness of the reducing joint is equal to the sum of the thicknesses of the tray and the pre-tightening nut; the outer surface of one end of the thin-wall steel pipe is coated with heat-resistant polyurethane resin and is just inserted into the large caliber of the reducer union, and the outer surface of the other end of the thin-wall steel pipe is coated with heat-resistant polyurethane resin and is just inserted into the temperature measuring hole, so that the solidified thin-wall steel pipe, the reducer union and the hole wall can be tightly bonded, the length of the thin-wall steel pipe is equal to that of the hollow threaded rod, and the diameter of the thin-wall steel pipe is 1-2mm smaller than that of the large caliber of the reducer union; the hollow threaded rod is screwed into the small caliber of the reducer union, the outer surface of the hollow threaded rod is provided with continuous threads which are the same as those of the hollow anchor rod, the diameter of the hollow threaded rod is the same as that of the hollow grouting anchor rod and is larger than that of the temperature sensor, and the length of the hollow threaded rod is 50-100mm larger than the thickness of the heat-insulating guniting layer, so that the heat-insulating guniting layer cannot seal the rigid protective sleeve, and the temperature sensor can be ensured to smoothly extend into the hollow threaded rod; the hollow threaded rod is just inserted into the circular hole, the screwing-in fixing nut is connected with the integral connecting device, and the sealing plug is plugged before guniting, so that grout does not enter the rigid protective sleeve in the guniting process.
The invention relates to a construction method of a deep high-temperature rock roadway heat-insulation support system, which comprises the following steps:
s1 construction of anchor rod hole and measurement of temperature in hole
S1.1, anchor rod hole construction
Drilling a plurality of anchor rod holes on the section of the roadway by using a geological drilling machine according to a design scheme, and cleaning broken stones in the holes;
s1.2, initial in-hole temperature measurement
Connecting a temperature sensor with a control host machine through a cable, then extending the temperature sensor into the anchor rod hole at different depths for temperature measurement, and recording initial hole temperatures at different positions according to display readings on the control host machine;
s2 construction of outer layer heat insulation supporting and protecting ring
S2.1, construction of heat-resistant metal net
Knocking and asking the top of the roadway, brushing the roadway to a solid side and a solid top, and then lapping a heat-resistant metal net on the wall of the roadway, wherein the heat-resistant metal net is arranged according to three flowers;
s2.2, hollow grouting anchor rod construction
S2.2.1, screwing the steel expansion shell anchor head into the top end of the hollow anchor rod body and inserting into the anchor rod hole, screwing the matched grout stop plug, the tray and the pre-tightening nut into the bottom end of the hollow anchor rod body in sequence after reaching the bottom of the hole, pressing the heat-resistant metal mesh by the tray, and tightening the pre-tightening nut by a torque wrench;
s2.2.2, adding a heat-insulating grouting material into the stirring and grouting integrated machine for stirring, then quickly connecting the tail end of the grout outlet pipe to the hollow anchor rod body and injecting grouting grout, shutting down when grouting is full and the pressure reaches a designed value, and plugging a closing plug into the bottom end of the hollow anchor rod body;
s2.2.3, repeating the steps S2.2.1 and S2.2.2 until all hollow grouting anchor rods on the roadway section are constructed;
s2.2.4, sleeving the tail end of the cleaning pipe on a water pipe water separator hung on the roadway wall part right, and cleaning the inner cavity of the stirring and grouting integrated machine;
s3, temperature measuring hole construction and temperature measurement in hole
S3.1, temperature measuring hole construction
Taking down a sealing plug at the bottom end of the hollow anchor rod body to observe the solidification condition of grouting slurry, after the grouting slurry is completely solidified to form a slurry concretion body, drilling temperature measuring holes with the same quantity and parameters as anchor rod holes in the extending direction of a roadway by using a geological drilling machine according to a design scheme, and cleaning broken stones in the holes;
s3.2, rigid protective sleeve construction
Coating heat-resistant polyurethane resin on the outer surface of one end of the thin-wall steel pipe, inserting the coated heat-resistant polyurethane resin into the reducing joint, continuously coating heat-resistant polyurethane resin on the outer surface of the other end of the thin-wall steel pipe, immediately inserting the coated heat-resistant polyurethane resin into the temperature measuring hole, exposing the reducing joint outside the temperature measuring hole, and screwing the hollow threaded rod after the thin-wall steel pipe is tightly adhered to the wall of the temperature measuring hole;
s3.3, measuring the temperature in the hole after grouting
Connecting a temperature sensor with a control host machine through a cable, then extending the temperature sensor into the temperature measuring holes at different depths for temperature measurement, recording the temperature in the holes at different positions after grouting according to display readings on the control host machine, and comparing the temperature with the initial temperature in the holes;
s4 construction of inner layer heat insulation supporting and protecting ring
S4.1, construction of integral connecting device
Respectively inserting the bottom end of the hollow anchor rod body and the bottom end of the hollow threaded rod into a circular hole of the integral connecting device, screwing down a matched fixing nut, and then respectively plugging the bottom end of the hollow anchor rod body and the bottom end of the hollow threaded rod into sealing plugs;
s4.2, high-strength support construction
S4.2.1, placing the restraint shells into channel steel one by one, and then connecting to form an integral restraint shell;
s4.2.2, adding the raw materials of the high-temperature-resistant concrete into the stirring and grouting integrated machine for stirring, then quickly connecting the tail end of the grout outlet pipe to a grouting port on the restraint shell and injecting filling grout, and when the grouting is full and the support is formed, shutting down the machine, and plugging a sealing plug at the grouting port;
s4.3, construction of heat-insulating shotcrete layer
S4.3.1, after the filling slurry is completely solidified to form the cast-in-place concrete support, supplementing the raw material of high-temperature-resistant concrete, adding the raw material into the stirring and grouting all-in-one machine for continuous stirring, then spraying the tail end of the rapid slurry outlet pipe to the wall of the roadway, and shutting down the machine when the thickness of the sprayed layer and the shape of the designed section are reached;
s4.3.2, repeating the step S2.2.4 until the inner cavity of the stirring and grouting integrated machine is cleaned;
s5, temperature detection in temperature measuring hole and secondary heat insulation reinforcement
S5.1, measuring the temperature in the hole at the later stage
The method comprises the following steps of detaching a sealing plug at the bottom end of a hollow threaded rod, connecting a temperature sensor with a control host through a cable, then extending the temperature sensor into a temperature measuring hole to measure the temperature at different depths, recording the temperature in the hole at different positions at certain time according to display readings on the control host, comparing the temperature with the initial temperature in the hole and the temperature in the hole after grouting, and performing secondary heat insulation and reinforcement on a roadway when the temperature in the hole is abnormally increased;
s5.2, secondary heat insulation and reinforcement of roadway
And adding a heat insulation grouting material into the stirring and grouting integrated machine for stirring, then quickly connecting the tail end of the grout outlet pipe to the hollow threaded rod, injecting grouting grout, shutting down when the grouting is full and the pressure reaches a designed value, and plugging a closing plug into the bottom end of the hollow threaded rod.
The deep high-temperature rock layer roadway heat insulation support system and the construction method thereof can effectively solve the problem of high-temperature heat damage of the deep roadway and support symbiosis for a long time, reduce construction risks, save construction cost, provide guarantee for safe and smooth operation of the whole life cycle of the deep roadway, and obviously have good popularization and application values. Compared with the prior art, the invention has the following positive effects and advantages:
(1) the grouting heat insulation system and the high-strength support system can form a multi-layer, all-dimensional and large-range heat insulation support and guard ring, can effectively block high heat energy generated by the surrounding rock, and can fully cope with large deformation of the surrounding rock;
(2) the roadway cooling is realized by constructing the heat-insulating support and guard ring, the dependence on mechanical refrigeration is reduced, additional ventilation equipment is not required, the investment cost is reduced, the ventilation condition of the roadway is not changed, the loading of the existing ventilation system is avoided, and the adverse effect on the ventilation system is avoided;
(3) after the heat-insulating shotcrete layer is constructed, the surrounding rock and the support of the roadway can be completely sealed, so that the shape of the section of the roadway is optimized, a smooth inner wall is formed, the ventilation resistance of the roadway is reduced, the energy consumption of ventilation equipment is reduced, and the effects of energy conservation and emission reduction are achieved;
(4) the temperature detection system can detect the temperature of any position in the full-length range of the temperature measurement hole in real time, further grasp the actual heat insulation condition of the roadway, and can utilize the temperature measurement hole to carry out secondary heat insulation reinforcement on the roadway after the heat insulation support and protection ring fails due to the influences of tunneling, mining and the like.
Additional features and advantages of the invention may be set forth in the description which follows, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
While the drawings required for a particular embodiment of the invention will now be described in detail to more clearly illustrate the embodiment, it should be apparent that the drawings described below are illustrative of some embodiments of the invention and that other drawings may be derived therefrom by those skilled in the art without the benefit of the inventive faculty.
Fig. 1 is a schematic diagram of a roadway section structure of a deep high-temperature rock stratum roadway heat insulation support system.
Fig. 2 is an enlarged schematic view of a partial structure of the deep high-temperature rock roadway heat-insulating support system of the invention.
Fig. 3 is a schematic view of a hollow grouting anchor rod of a deep high-temperature rock roadway heat-insulation support system.
Fig. 4 is a schematic view of a high-strength support of the deep high-temperature rock roadway heat-insulating support system of the invention.
Fig. 5 is a schematic view of an integral connecting device of a deep high-temperature rock roadway heat-insulating support system.
Fig. 6 is a schematic diagram of a rigid protective sleeve of the deep high-temperature rock roadway heat-insulating support system.
Illustration of the drawings: 1-laneway; 2-surrounding rock; 3-grouting a heat insulation system; 30-anchor rod holes; 31-hollow grouting anchor rod; 311-a hollow mooring body; 312-steel expansion shell anchor head; 313-grout stop; 314-a tray; 315-pretension nut; 316-a stabilization section; 317-slurry overflow holes; 318-closing plug; 32-heat insulation grouting material; 4-high strength support system; 41-heat resistant metal mesh; 42-high strength stent; 421-a constraining enclosure; 422-grouting port; 423-high temperature resistant concrete; 43-heat insulation guniting layer; 5-a temperature detection system; 50-temperature measuring holes; 51-a rigid protective sheath; 511-hollow threaded rod; 512-thin wall steel pipe; 513-a reducer union; 52-temperature sensor; 53-control host; 54-a cable; 6-integral connection means; 61-channel steel; 62-straight steel plate; 63-circular holes; 64-a fixing nut; 7-stirring and grouting integrated machine; 71-a stirring barrel; 72-a pulp outlet pipe; 73-a cleaning tube; 8-water pipe water separator.
Detailed Description
The deep high-temperature rock roadway heat-insulating support system and the construction method thereof according to the present invention will be further described in detail with reference to the following specific embodiments and accompanying drawings.
It should be noted at the outset that the following description is exemplary only and is intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As shown in attached figures 1-6, a surrounding rock 2 of a deep high-temperature rock layer roadway 1 needs to be subjected to heat insulation support, a typical section is taken for explanation, the section is in the shape of a straight-wall semicircular arch, the clear height is 5m, and the clear width is 4.5m, and the deep high-temperature rock layer roadway heat insulation support system disclosed by the invention is supposed to be adopted, comprises a grouting heat insulation system 3, a high-strength support system 4 and a temperature detection system 5, and is connected with the three systems through an integral connecting device 6; the grouting heat insulation system 4 is characterized in that a heat insulation grouting material 32 is injected into 7 hollow grouting anchor rods 31 which are driven into anchor rod holes 30, then the grouting material overflows and spreads to surrounding crushed rock mass, and an outer layer heat insulation supporting and protecting ring is formed, wherein the depth of each anchor rod hole 30 is 2000mm, and the diameter of each anchor rod hole is 35 mm; the high-strength supporting system 4 is characterized in that a heat-resistant metal net 41, a high-strength bracket 42 and a heat-insulating guniting layer 43 are sequentially paved on the surface of the surrounding rock 2 of the roadway 1 to form an inner-layer heat-insulating supporting and protecting ring; the temperature detection system 5 measures the temperature by penetrating a temperature sensor 52 through a rigid protective sleeve 51 inserted into a temperature measuring hole 50 to a designated position, and displays the reading on a control host 53, wherein the depth of the temperature measuring hole 50 is 2000mm, the diameter of the temperature measuring hole is 35mm, and the diameter of the temperature sensor 601 is 20 mm.
The specific implementation of each component of the invention is as follows:
(1) integral connection device 6
The integral connecting device 6 consists of a channel steel 61 and two straight steel plates 62 welded at the tail ends of the legs of the channel steel 61, the appearance of the integral connecting device is in a symmetrical concave shape, wherein the channel steel 61 is in contact with the high-strength support 42, and the two straight steel plates 62 are respectively in contact with the hollow grouting anchor rod 31 and the rigid protective sleeve 51; the length of the channel steel 61 is 150mm, the height of the inner side of the waist end is 150mm, the width of the inner side of the leg end is 105mm, and the thickness is 10 mm; the length of the straight steel plate 62 is 150mm, the width is 150mm, and the thickness is 10 mm; a circular hole 63 is drilled in the center of the straight steel plate 62, and the inner diameter of the circular hole is 30 mm.
(2) Grouting heat insulation system 3
The hollow grouting anchor rod 31 consists of a hollow anchor rod body 311 and matched components thereof, wherein the matched components comprise a steel expansion shell anchor head 312 screwed in the top end of the hollow anchor rod body 311, and further comprise a grout stop plug 313, a tray 314 and a pre-tightening nut 315 which are sequentially screwed in the bottom end of the hollow anchor rod body 311; the diameter of the hollow anchor rod body 311 is 28mm, the length is 2100mm, the wall thickness is 5mm, the outer surface of the hollow anchor rod body 311 is provided with continuous threads matched with the pre-tightening nut 315, and the thickness of the pre-tightening nut 315 is 35 mm; the tray 314 is a square protruding round hole anchor plate, the side length of the tray 314 is 120mm, and the thickness of the tray 314 is 10 mm; the bottom end of the hollow anchor rod body 311 is coated with heat-resistant polyurethane resin and then solidified to form a stable section 316, and the coating length is 1050 mm; drilling grout overflow holes 317 on four sides of the top end of the hollow anchor rod body 311, wherein the drilling length is 1050mm, the diameter of each grout overflow hole 317 is 5mm, and the distance between every two grout overflow holes is 10 mm; the hollow anchor rod body 311 is just inserted into the circular hole 63, the fixing nut 64 is screwed in and connected with the integral connecting device 6, the thickness of the fixing nut 64 is 35mm, and the fixing nut is plugged into the closing plug 318 after grouting.
The heat-insulating grouting material 32 is prepared by stirring portland cement, river sand, fly ash, vitrified micro bubbles and water in a stirring barrel 71 of the stirring and grouting all-in-one machine 7 to form grouting slurry, wherein the mixing amount of the river sand (accounting for the total mass of the cement and the fly ash) is 60%, the mixing amount of the fly ash is 40%, the mixing amount of the vitrified micro bubbles is 10% and the mixing amount of the water is 100%, and then the grouting slurry is injected into the hollow anchor rod body 311 through a slurry outlet pipe 72 of the stirring and grouting all-in-one machine 7; the heat-insulating grouting material 32 is prepared into a standard sample and tested to obtain a heat conductivity coefficient of 0.15W/(m.K) and a cube compressive strength of 11.7 MPa; the inner diameter of the pulp outlet pipe 72 is 30 mm; the tail end of a cleaning pipe 73 of the stirring and grouting integrated machine 7 is connected to a water pipe separator 8 hung on the side of the roadway 1.
(3) High-strength supporting system 4
The heat-resistant metal net 41 is a diamond net which is coated by heat-resistant polyurethane resin, and the mesh size of the heat-resistant metal net 41 is 50 mm; the lap length of the heat-resistant metal mesh 41 is 100mm, and every 200mm is connected with one buckle and is in close contact with the wall of the roadway 1 by virtue of the tray 314.
The high-strength support 42 is a cast-in-place constraint concrete support with the surface treated by heat-resistant polyurethane resin, a steel pipe is used as a constraint shell 421, the cross section is square, the side length of the cross section is 150mm, the wall thickness is 5mm, high-temperature-resistant concrete 423 is poured from a grouting opening 422 at the top end of the constraint shell 421, and the diameter of the grouting opening 422 is 28 mm; the high-temperature resistant concrete 423 is ceramsite concrete doped with fly ash, and is prepared by stirring portland cement, river sand, fly ash, shale ceramsite and water in a stirring barrel 71 of the stirring and grouting all-in-one machine 7 to form filling slurry, wherein the mixing amount of the river sand is 188%, the mixing amount of the fly ash is 10%, the mixing amount of the shale ceramsite is 115% and the mixing amount of the water is 0.4; the high-temperature resistant concrete 423 is prepared into a standard sample and tested to obtain a thermal conductivity coefficient of 0.31W/(m.K) and a cube compressive strength of 34.7 MPa.
The heat-insulating guniting layer 43 is a heat-insulating protective layer which is formed by spraying guniting slurry on the wall of the roadway 1 and can cover the heat-resistant metal mesh 41 and the high-strength support 42, and the thickness of the heat-insulating guniting layer 43 is 200 mm; the material and mixing ratio of the guniting slurry is consistent with the filling slurry of the high-strength bracket 42, namely the high-temperature resistant concrete 423.
(4) Temperature detection system 5
The rigid protective sleeve 51 consists of a hollow threaded rod 511, a thin-wall steel pipe 512 and a matched reducer union 513; the inner diameter of the reducer union 513 with a small diameter is 30mm, the small diameter is provided with continuous threads matched with the hollow anchor rod body 311, the inner diameter of the large diameter is 35mm, and the thickness of the reducer union 513 is 45 mm; the outer surface of one end of the thin-wall steel pipe 512 is coated with heat-resistant polyurethane resin and is just inserted into the large caliber of the reducer union 513, the outer surface of the other end of the thin-wall steel pipe 512 is coated with heat-resistant polyurethane resin and is just inserted into the temperature measuring hole 50, and the diameter of the thin-wall steel pipe 512 is 33mm, and the length of the thin-wall steel pipe is 300 mm; the hollow threaded rod 511 is screwed into the small diameter of the reducer union 513, the outer surface of the hollow threaded rod 511 is provided with continuous threads which are the same as those of the hollow anchor rod body, the diameter of the hollow threaded rod 511 is 28mm, and the length of the hollow threaded rod 511 is 300 mm; the hollow threaded rod 511 is inserted right into the circular hole 63, screwed into the fixing nut 64 and connected to the integral connection device 6, and plugged into the closing plug 318 before guniting.
The invention relates to a construction method of a deep high-temperature rock roadway heat-insulation support system, which comprises the following steps: s1 construction of anchor rod hole 30 and temperature measurement in hole
S1.1, anchor rod hole 30 construction
s1.2, initial in-hole temperature measurement
Connecting the temperature sensor 52 with a control host 53 through a cable 54, then extending the temperature sensor 52 into the anchor rod hole 30 at different depths for temperature measurement, and recording initial hole temperature at different positions according to display readings on the control host 53;
s2 construction of outer layer heat insulation supporting and protecting ring
S2.1, construction of heat-resistant metal net 41
Knocking and jacking the roadway 1, brushing the roadway 1 to a solid side and a solid top, and then overlapping heat-resistant metal nets 41 on the wall of the roadway 1, wherein the heat-resistant metal nets are arranged according to three flowers;
s2.2, construction of hollow grouting anchor rod 31
S2.2.1, screwing the steel expansion shell anchor head 312 into the top end of the hollow anchor rod body 311 and inserting into the anchor rod hole 30, screwing the matched grout stop plug 313, the tray 314 and the pre-tightening nut 315 into the bottom end of the hollow anchor rod body 311 in sequence after reaching the bottom of the hole, pressing the heat-resistant metal mesh 41 by the tray 314, and tightening the pre-tightening nut 315 by a torque wrench;
s2.2.2, adding the heat-insulating grouting material 32 into the stirring barrel 71 of the stirring and grouting all-in-one machine 7 for stirring, then quickly connecting the tail end of the grout outlet pipe 72 to the hollow anchor rod body 311 and injecting grouting grout, shutting down when the grouting is full and the pressure reaches a designed value, and plugging the closing plug 318 into the bottom end of the hollow anchor rod body 311;
s2.2.3, repeating the steps S2.2.1 and S2.2.2 until the construction of 7 hollow grouting anchor rods 31 on the section of the roadway 1 is completed;
s2.2.4, connecting the tail end of the cleaning pipe 73 to a water pipe water separator 8 hung on the roadway wall part, and cleaning the stirring barrel 71;
s3, temperature measuring hole 50 construction and temperature measurement in hole
S3.1, temperature measuring hole 50 construction
Taking down the closing plug 318 at the bottom end of the hollow anchor rod body 311 to observe the solidification condition of grouting slurry, after the grouting slurry is completely solidified to form a slurry concretion body, drilling 7 temperature measuring holes 50 with the same parameters as the anchor rod holes 30 in the extending direction of the roadway 1 by using a geological drilling machine according to the design scheme, and cleaning broken stones in the holes;
s3.2, construction of rigid protective sleeve 51
The method comprises the following steps of coating heat-resistant polyurethane resin on the outer surface of one end of a thin-wall steel pipe 512, then immediately inserting the thin-wall steel pipe 512 into the large-caliber inner part of a reducing joint 513, coating heat-resistant polyurethane resin on the outer surface of the other end of the thin-wall steel pipe 512, immediately inserting the thin-wall steel pipe 512 into a temperature measuring hole 50, exposing the reducing joint 513 outside the temperature measuring hole 50, and screwing a hollow threaded rod 511 into the small-caliber inner part of the reducing joint 513 after the thin-wall steel pipe 512 is tightly adhered to the hole wall of the temperature measuring hole 50; s3.3, measuring the temperature in the hole after grouting
Connecting a temperature sensor 52 with a control host 53 through a cable 54, then extending the temperature sensor 52 into the temperature measuring hole 50 at different depths for temperature measurement, recording the in-hole temperature after grouting at different positions according to display readings on the control host 53, and comparing the in-hole temperature with the initial in-hole temperature;
s4 construction of inner layer heat insulation supporting and protecting ring
S4.1, construction of integral connecting device 6
The bottom end of the hollow anchor rod body 311 and the bottom end of the hollow threaded rod 511 are respectively inserted into the circular hole 63 of the integral connecting device 6, the matched fixing nut 64 is screwed, and then the closing plug 318 is respectively plugged into the bottom end of the hollow anchor rod body 311 and the bottom end of the hollow threaded rod 511;
s4.2, high-strength support 42 construction
S4.2.1, placing the restraint shell 421 into the channel steel 61 one by one, and then connecting to form an integral restraint shell 421;
s4.2.2, adding the raw materials of the high-temperature-resistant concrete 423 into a stirring barrel 71 of the stirring and grouting all-in-one machine 7 for stirring, then quickly connecting the tail end of a grout outlet pipe 72 to a grouting port 422 on a restraint shell 421 and injecting filling grout, stopping the machine when grouting is full and a support is formed, and plugging a closing plug 318 at the grouting port 422; s4.3, construction of heat-insulating guniting layer 43
S4.3.1, after the filling slurry is completely solidified to form the cast-in-place concrete support, supplementing the raw material of the high temperature resistant concrete 423 and adding the raw material into the stirring barrel 71 of the stirring and grouting all-in-one machine 7 for continuous stirring, then spraying the tail end of the rapid slurry outlet pipe 72 aiming at the wall of the roadway 1, and shutting down the machine when the designed sprayed layer thickness and the designed section shape are reached; s4.3.2, repeating the step S2.2.4 until the stirring barrel 71 of the stirring and grouting integrated machine 7 is cleaned;
s5, detecting the temperature in the temperature measuring hole 50 and reinforcing the secondary heat insulation
S5.1, measuring the temperature in the hole at the later stage
The sealing plug 318 at the bottom end of the hollow threaded rod 511 is dismounted, the temperature sensor 52 is connected with the control host 53 through the cable 54, then the temperature sensor 52 is stretched into the temperature measuring hole 50 at different depths for temperature measurement, the temperature in the hole at a certain moment at different positions is recorded according to display readings on the control host 53 and compared with the temperature in the initial hole and the temperature in the hole after grouting, and secondary heat insulation and reinforcement are needed to be carried out on the surrounding rock 2 of the roadway 1 when the temperature in the hole is abnormally increased;
s5.2, secondary heat insulation and reinforcement
Adding the raw materials of the heat-insulating grouting material 32 into a stirring barrel 71 of the stirring and grouting all-in-one machine 7 for stirring, then quickly connecting the tail end of a grout outlet pipe 72 to the hollow threaded rod 511 and injecting grouting grout, shutting down when the grouting is full and the pressure reaches the designed value, and plugging a closing plug 318 at the bottom end of the hollow threaded rod 511.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way; those of ordinary skill in the art will understand that: any simple modifications and equivalent substitutions can be made to the above embodiments without inventive step according to the technical essence of the present invention, and the essence of the corresponding technical solution does not depart from the scope of the technical solution of the present invention.
Claims (2)
1. A deep high-temperature rock stratum roadway heat insulation support system is characterized by comprising a grouting heat insulation system, a high-strength support system and a temperature detection system, wherein the three systems are organically connected through an integral connecting device; the grouting heat insulation system injects heat insulation grouting materials into a hollow grouting anchor rod which is driven into an anchor rod hole, and then overflows and diffuses to surrounding broken rock mass to form an outer layer heat insulation support and protection ring; the high-strength support system is characterized in that a heat-resistant metal net, a high-strength support and a heat-insulating guniting layer are sequentially paved on the surface of surrounding rock of a roadway to form an inner-layer heat-insulating support and protection ring; the temperature detection system measures the temperature by penetrating a temperature sensor through a rigid protective sleeve inserted into a temperature measurement hole to reach a specified position, and displays a reading on the control host; the diameter of the anchor rod hole is 20-45mm, and the depth is 1500-3000 mm; the diameter and the depth of the temperature measuring hole are the same as those of the adjacent anchor rod hole, and the temperature measuring hole and the adjacent anchor rod hole are arranged in parallel along the trend of the roadway at a distance of 200-300 mm; the integral connecting device consists of channel steel and two straight steel plates welded at the tail ends of the leg parts of the channel steel, and the appearance of the integral connecting device is in a symmetrical concave shape; the channel steel is in contact with the high-strength support, the length of the channel steel is 150-; the two straight steel plates are respectively contacted with the hollow grouting anchor rod and the rigid protective sleeve, the length and the thickness of each straight steel plate are the same as those of the channel steel, and the width of each straight steel plate is 100-150 mm; a circular hole is drilled in the center of the straight steel plate, the diameter of the circular hole is 5-10mm smaller than that of the anchor rod hole, and the two circular holes are respectively coaxial with the anchor rod hole and the adjacent temperature measuring hole; the hollow grouting anchor rod consists of a hollow anchor rod body and a matched component, wherein the matched component comprises a steel expansion shell anchor head screwed in the top end of the hollow anchor rod body, and further comprises a grout stop plug, a tray and a pre-tightening nut which are sequentially screwed in the bottom end of the hollow anchor rod body; the length of the hollow anchor rod body is 50-100mm greater than the depth of the anchor rod hole, the wall thickness is 5-7mm, the diameter is 1-2mm smaller than that of the circular hole, and the outer surface of the hollow anchor rod body is provided with continuous threads matched with the pre-tightening nut; the tray is a square protruding round hole anchor plate, the side length of the tray is not more than the width of a straight steel plate, and the sum of the thicknesses of the tray and the pre-tightening nut is equal to the difference between the height of the inner side of the waist end and the width of the inner side of the leg end of the channel steel; the bottom end of the hollow anchor rod body is coated with heat-resistant polyurethane resin and solidified to form a stable section, and the coating length is half of the length of the hollow anchor rod body; drilling grout overflow holes on four sides of the top end of the hollow anchor rod body, wherein the drilling length is half of the length of the hollow anchor rod body, the diameter of each grout overflow hole is 5-10mm, and the distance between every two grout overflow holes is 10-50 mm; the hollow anchor rod body is just inserted into the circular hole, a fixing nut is screwed in and connected with the integral connecting device, the specification of the fixing nut is consistent with that of a pre-tightening nut, and a sealing plug is plugged in the fixing nut after grouting; the heat-insulating grouting material takes portland cement, river sand, fly ash and vitrified micro bubbles as main materials, is poured into a stirring barrel of the stirring and grouting all-in-one machine, is added with water, is mixed and stirred to form grouting slurry, and is injected into the hollow anchor rod body through a slurry outlet pipe of the stirring and grouting all-in-one machine; the heat-insulating grouting material is tested to be not more than 0.2W/(m.K) in heat conductivity coefficient and not less than 10MPa in cubic compressive strength; the inner diameter of the grout outlet pipe is 1-2mm larger than the diameter of the hollow anchor rod body; the tail end of a cleaning pipe of the stirring and grouting integrated machine is just sleeved on a water pipe water separator hung on the roadway wall part; the heat-resistant metal net is a diamond net or a graticule which is coated with heat-resistant polyurethane resin and is in close contact with the wall of the roadway by means of a tray, and the mesh size of the heat-resistant metal net is 5-25mm larger than the diameter of the anchor rod hole; the high-strength bracket is a cast-in-place restraint concrete bracket of which the surface of a restraint shell is coated with heat-resistant polyurethane resin, and the restraint shell can be a flexible restraint shell or a rigid restraint shell; the cross section of the restraint shell is square or round, and the side length or the diameter of the cross section is equal to the height of the inner side of the waist end of the channel steel; the cast-in-situ confined concrete support is formed by pouring high-temperature-resistant concrete from a grouting opening at the top end of the confined shell and curing, and the diameter of the grouting opening is equal to that of the hollow anchor rod body; the high-temperature resistant concrete is ceramsite concrete doped with fly ash, and silicate cement, river sand, fly ash and shale ceramsite are used as main materials, poured into a stirring barrel of the stirring and grouting integrated machine, added with water, mixed and stirred to form filling slurry; the heat conductivity coefficient of the high-temperature resistant concrete is not more than 0.4W/(m.K) measured by tests, and the cubic compressive strength is not less than 30 MPa; the heat-insulation guniting layer is a heat-insulation protective layer which is formed by spraying guniting slurry on the wall of the roadway and can cover the heat-resistant metal net and the high-strength support, and the thickness of the heat-insulation guniting layer is 150-200 mm; the material and the mixing ratio of the guniting slurry are consistent with the filling slurry of the high-strength bracket; the rigid protective sleeve consists of a hollow threaded rod, a thin-wall steel pipe and a matched reducing joint; the inner diameter of the small diameter of the reducing joint is equal to the diameter of the circular hole, the small diameter is provided with continuous threads matched with the hollow anchor rod body, the inner diameter of the large diameter is equal to the diameter of the temperature measuring hole, and the thickness of the reducing joint is equal to the sum of the thicknesses of the tray and the pre-tightening nut; the outer surface of one end of the thin-wall steel pipe is coated with heat-resistant polyurethane resin and is just inserted into the large caliber of the reducer union, the outer surface of the other end of the thin-wall steel pipe is coated with heat-resistant polyurethane resin and is just inserted into the temperature measuring hole, the length of the thin-wall steel pipe is equal to that of the hollow threaded rod, and the diameter of the thin-wall steel pipe is 1-2mm smaller than that of the large caliber of the reducer union; the hollow threaded rod is screwed into the small caliber of the reducer union, the outer surface of the hollow threaded rod is provided with continuous threads which are the same as those of the hollow anchor rod, the diameter of the hollow threaded rod is the same as that of the hollow grouting anchor rod and is larger than that of the temperature sensor, and the length of the hollow threaded rod is 50-100mm larger than the thickness of the heat-insulating shotcrete layer; the hollow threaded rod is just inserted into the circular hole, the screwing-in fixing nut is connected with the integral connecting device, and the sealing plug is plugged before guniting.
2. The construction method of the deep high-temperature rock stratum roadway heat-insulation support system according to claim 1, characterized by comprising the following steps:
s1, anchor rod hole construction and in-hole temperature measurement
S1.1, anchor rod hole construction
Drilling a plurality of anchor rod holes on the section of the roadway by using a geological drilling machine according to a design scheme, and cleaning broken stones in the holes;
s1.2, initial in-hole temperature measurement
Connecting a temperature sensor with a control host machine through a cable, then extending the temperature sensor into the anchor rod hole at different depths for temperature measurement, and recording initial hole temperatures at different positions according to display readings on the control host machine;
s2 construction of outer layer heat insulation supporting and protecting ring
S2.1, construction of heat-resistant metal net
Knocking and asking the top of the roadway, brushing the roadway to a solid side and a solid top, and then lapping a heat-resistant metal net on the wall of the roadway, wherein the heat-resistant metal net is arranged according to three flowers;
s2.2, hollow grouting anchor rod construction
S2.2.1, screwing the steel expansion shell anchor head into the top end of the hollow anchor rod body and inserting into the anchor rod hole, screwing the matched grout stop plug, the tray and the pre-tightening nut into the bottom end of the hollow anchor rod body in sequence after reaching the bottom of the hole, pressing the heat-resistant metal mesh by the tray, and tightening the pre-tightening nut by a torque wrench;
s2.2.2, adding a heat-insulating grouting material into the stirring and grouting integrated machine for stirring, then quickly connecting the tail end of the grout outlet pipe to the hollow anchor rod body and injecting grouting grout, shutting down when grouting is full and the pressure reaches a designed value, and plugging a closing plug into the bottom end of the hollow anchor rod body;
s2.2.3, repeating the steps S2.2.1 and S2.2.2 until all hollow grouting anchor rods on the roadway section are constructed;
s2.2.4, sleeving the tail end of the cleaning pipe on a water pipe water separator hung on the roadway wall part right, and cleaning the inner cavity of the stirring and grouting integrated machine;
s3, temperature measuring hole construction and temperature measurement in hole
S3.1, temperature measuring hole construction
Taking down a sealing plug at the bottom end of the hollow anchor rod body to observe the solidification condition of grouting slurry, after the grouting slurry is completely solidified to form a slurry concretion body, drilling temperature measuring holes with the same quantity and parameters as anchor rod holes in the extending direction of a roadway by using a geological drilling machine according to a design scheme, and cleaning broken stones in the holes;
s3.2, rigid protective sleeve construction
Smearing heat-resistant polyurethane resin on the outer surface of one end of the thin-wall steel pipe, inserting the smeared heat-resistant polyurethane resin into the reducing joint, continuously smearing heat-resistant polyurethane resin on the outer surface of the other end of the thin-wall steel pipe, immediately inserting the smeared heat-resistant polyurethane resin into the temperature measuring hole, exposing the reducing joint outside the temperature measuring hole, and screwing the thin-wall steel pipe into the hollow threaded rod after the thin-wall steel pipe is tightly adhered to the hole wall of the temperature measuring hole;
s3.3, measuring the temperature in the hole after grouting
Connecting a temperature sensor with a control host machine through a cable, then extending the temperature sensor into the temperature measuring holes at different depths for temperature measurement, recording the temperature in the holes at different positions after grouting according to display readings on the control host machine, and comparing the temperature with the initial temperature in the holes;
s4 construction of inner layer heat insulation supporting and protecting ring
S4.1, construction of integral connecting device
Respectively inserting the bottom end of the hollow anchor rod body and the bottom end of the hollow threaded rod into a circular hole of the integral connecting device, screwing down a matched fixing nut, and then respectively plugging the bottom end of the hollow anchor rod body and the bottom end of the hollow threaded rod into sealing plugs;
s4.2, high-strength support construction
S4.2.1, placing the restraint shells into the channel steel one by one in sections, and then connecting to form an integral restraint shell;
s4.2.2, adding the raw materials of the high-temperature-resistant concrete into the stirring and grouting integrated machine for stirring, then quickly connecting the tail end of the grout outlet pipe to a grouting port on the restraint shell and injecting filling grout, stopping the machine when grouting is full and the support is formed, and plugging a sealing plug at the grouting port;
s4.3, construction of heat-insulating shotcrete layer
S4.3.1, after the filling slurry is completely solidified to form the cast-in-place concrete support, supplementing the raw material of high-temperature-resistant concrete, adding the raw material into the stirring and grouting all-in-one machine for continuous stirring, then spraying the tail end of the rapid slurry outlet pipe to the wall of the roadway, and shutting down the machine when the thickness of the sprayed layer and the shape of the designed section are reached;
s4.3.2, repeating the step S2.2.4 until the inner cavity of the stirring and grouting integrated machine is cleaned;
s5, temperature detection in temperature measuring hole and secondary heat insulation reinforcement
S5.1, measuring the temperature in the hole at the later stage
The method comprises the following steps of detaching a sealing plug at the bottom end of a hollow threaded rod, connecting a temperature sensor with a control host through a cable, then extending the temperature sensor into a temperature measuring hole to measure the temperature at different depths, recording the temperature in the hole at different positions at certain time according to display readings on the control host, comparing the temperature with the initial temperature in the hole and the temperature in the hole after grouting, and performing secondary heat insulation and reinforcement on a roadway when the temperature in the hole is abnormally increased;
s5.2, secondary heat insulation and reinforcement of roadway
And adding a heat-insulating grouting material into the stirring and grouting all-in-one machine for stirring, then quickly connecting the tail end of the grout outlet pipe to the hollow threaded rod and injecting grouting grout, shutting down when grouting is full and pressure reaches a designed value, and plugging a closing plug into the bottom end of the hollow threaded rod.
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| CN102565126A (en) * | 2012-01-16 | 2012-07-11 | 中国矿业大学 | Cooling effect simulating experiment device of roadway heat insulating injection material |
| CN102996121A (en) * | 2012-11-21 | 2013-03-27 | 广西大学 | Temperature measuring method of shallow holes of primary rock |
| CN204253076U (en) * | 2014-11-06 | 2015-04-08 | 河南理工大学 | Deep Mine Climatic regionalization and roadway support combined governance device |
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